Gear-cutting machine



(No Model.)

C. E. ALBRO.

Y GEAR CUTTING MACHIN. 180.281.820.4 l Patented July 24, 1883.

1MM' @@Qmazgm UNITED STATES PATENT OFFICE.

CHARLES E. ALBRO, OF PHILADELPHIA, PENNSYLVANIA.

GEAR-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 281,820, dated J'uly 24, 1883.

^ Application `filed August il, 1882. (No model.)

To all whom, t may concern:

Be it known that I, Cniinrns E. Amano, of the city and county of Philadelphia, and State of Pennsylvania, have invented an Improvecured to the revolving master-wheel shaft of a gear-cutting machine, substantially as set forth in the patent granted to me, No. 219,892, dated September 23, 187 9, and in another pending application of mine, the revolution of the frame being independent of the revolution of the cutter; further, in providing the vframe withl suitable mechanism whereby it may be adjusted back or forth, and thus perform its function without making a complete revolution; and in many details of construction, al1 of which are fully set out in the following specification and shownin the accompanying` drawings, which form part thereof.

The object of my invention is to provide a rotary cutter and adapt it to gear-cutting maehines, whereby it is enabled to cut worms for Worm-wheel gearing.

In the drawings, Figure l is a front elevation of my improved gear-cutting mechanism, showing it in the act of cutting a worm. Fig. 2 is a sectional elevation of same on line .r x, and Fig. 3 is a side elevation of a gear-cutting machine with my improved gear-cutter at tached thereto.

A is the frame of the gear-cutting machine.

Bis the master-wheel shaft, and carries at one end the master-wheel C.

Mevshin g with the master-wheel is the wormy gear D. Y

E is a hinged or sliding frame, and carries the shaft or mandrel I, upon which the blank to be out into a worm is placed.

F are the train-gears, by which the relative movements or rotation of the mandrel or shaft I and master-wheel shaft B are governed.

H is a rack with which the pinion G, attached to the frame E, meshes to regulate the position of the mandrel or shaft I, upon which the blank to be cut is placed.

K is the driving-shaft.

The foregoing is a brief description of one form of gear-cutting machine, and is in substance similar to the patent referred to above.

To the end of the master-wheel shaft B, Isecure the hub L, having the iiange Z.

M is the cutter-frame, and is arranged to fit upon the hub L, being provided with an annular projection, on', concentric with the flange of the hub, but not fitting the periphery of the same, as an annular space, m, is left between them.

Through the plate or frame M, I pass bolts N, which pass through the space m and ringplate N, which is loosely arranged over said annular space and rests upon the flange Z and projection m. By loosening the bolts N the frame M may beturned forward or backward and adjusted upon the hub L, the bolts moving in the annular groove or space m.

Securedto the frame M is a bearing-casting, O, which carries the two shafts P and P*, which are set at right angles to each other, the latter of said shafts being in line with the master-wheel shaft B. The shaft PL carries upon its inner end a bevel-pinion, P, and upon its outer end a cone-pulley, P5. The pinion P3 meshes with the bevel-wheel P on the inner end of shaft P, the outer end of which carries another bevel-wheel, P2. This wheel P2 meshes with abevel-wheel, R, held in bearing O by collars r r, and is provided with a feather or key constructed in the usual mann er,which fits the groove i" in the shaft R', which is free to slide through the wheel R, but revolves with it. One end of this grooved shaft R is supported in bearing O`, and carries on its end a mitergear, R2, which meshes with its fellow It, secured upon the end of shaft R2 which gears with shaft RT by means of pinions or spur wheels and It These shafts R4 RT are supported in bearings O, which, with bearing O,

are secured to an adjustable plate, Q, ar-

ranged to be adjusted in the direction of the shaft R upon the frame M by means of bolts I and slots t, or any other equivalent device, as the well-known guides and screw.

To the end of shaft R7 is removably secured the cutter S, the plane of revolution of which passes through the center line of the masterwheel shaft B.

J represents a worm-blank secured upon the mandrel or shaft I, and in the act of being cut.

I do not limit myself to the construction IOC -3 senseo shown, as it may be modified in various waysas, for instance, the shaft l? may gear directly with the cutter-shaft PT, or the frame M may be secured directly upon the shaft B-my invention comprehending, broadly, a revolving cutter having an independent movement about a fixed center.

The operation is as follows: The machine being set in motion, after causing the rotation of the cone-pulley P5, the master-wheel shaftB moves the frame M, with its cutter, slowly in the direction ofthe arrow. The relative speeds of the master-wheel shaft B and mandrel I be' ing governed to suit the pitch of the worm to be cut, the blank J is slowly rotated, the said blank and frame moving in the same relation as if they were respectively the worm and worm-wheel, and as the cutter S has an in' dependent and more rapid rotation it cuts the thread upon the blank, as shown. One passage of the cutter over the blank is sufficient to finish the thread upon the same, but if itis desired to go over it again it is readily accomplished by loosening the bolts N and turning the frame M allthe way around, or moving it back again. If desired, the cutter may be brought around again by continuing the action of the machine.

By this mechanism single or double threads may be cut, the latter being accomplished by a double operation of the machine, or by it with two rotating cutters radiating from the center of the master-wheel shaft.

The worm cut by this machine is what is technically known as the Hindlcy Screw, and is one in which the outer surface of the screw or worin is curved to correspond to the periphery or rootcircle of the worm-wheel with which it is to mesh.

rlhe adjustable frame Q is used to regulate" distance of the cutter S from the shaft B to make the worm suit any desired worm-Wheel.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A cutter for gear-cutting machines, having two motions-one a rotary motion upon its own axis, and the other an independent rotary motion about a fixed point-in combination with a rotating spindle adapted to hold and rotate the gear-blank to be cut with a speed having a given relation to the rotation of the cutter about the fixed point, substantially as and for the purpose set forth.

2. In mechanism for cutting gearing, a frame arranged to revolve about a center and provided with a revolving or rotary cutter, in combination with means to rotate said cutter, and means to rotate the frame, and a rotating spindle adapted to hold and rotate the gear-blank to be cut with a speed having a given relation to the rotation of the cutter about the fixed center, substantially as and for the purpose specified.

3. In mechanism for cutting gearing, a frame arranged to revolve or vibrate about a fixed center, and provided with a rotary cutter whose plane of revolution passes through said fixed center, in combination with independent mechanism to rotate both the cutter and frame at the same time, substantially as and for the purpose specified.

4. In mechanism for cutting gearing, aframe arranged to revolve or vibrate about a fixed center and provided with a rotary cutter, in combination with independent mechanism to rotate both the cutter and frame at the same time, a rotating spindle adapted to hold and rotate the gear-blank to be cut with a speed having a given relation to the rotation of the cutter about the fixed center, and means to adjust said cutter to or from the fixed center, substantially as and for the purpose specified.

5. In mechanism for cutting gearing, a shaft carrying on its end a frame provided with a rotary cutter, in combination with independent mechanism to rotate s'aid cutter and frame both at the same time, a revolving mandrel or shaft upon which the blank to be cut is placed, and means to control the relative speed or revolution of said mandrel and shaft which carries the cutter-frame, substantially as and for the purpose specified.

6. In mechanism for cutting gearing, aframe arranged to revolve or vibrate about a fixed center and provided with a rotary cutter, in combination with a shaft to rotate said frame, means to adjust said frame upon its shaft, and independent mechanism to rotate both the cutter and shaft, substantially as and for the purpose specified.

7. In mechanism for cutting gearing, a frame arranged to rotate about a fixed center and provided with a rotary cutter, in combination with a shaft to rotate said frame, means to adjust said frame upon its shaft, means to adjust said cutter to or from the fixed center, and independent mechanism to rotate both the cutter and shaft, substantially as and for the purpose specified.

S. The combination of shaft B, hub L, shafts P Pt R B4 It?, gears I l?AZ P It R2 BB, bearings O O 02 O, plate Q, and cutter S, substantially as and for the purpose specified.

In testimony of which invention I hereunto set my hand.

CHARLES E. ALBRO.

Witnesses:

R. A. Gavin, JOHN XV. SrEwARD.

IOO 

